Basic Java program to Remove specified element from TreeSet example

1.Basic java example program to remove specified  element from treeset.

1. package com.TreeSetExamplePrograms;
2. 
   
3. public Class TreeSetRemoveDemo{ 
5. import java.util.TreeSet;
6.  
7. public static void main(String args[]) {
8. //create TreeSet object
9.  
10. TreeSet<Integer> treeSet = new TreeSet<Integer>();
11.            
12.    //add elements to TreeSet object
13. treeSet.add(11);
14. treeSet.add(12);
15. treeSet.add(13);
16.  
17. System.out.println("TreeSet before removal : " + treeSet);
18.            
19.  /*
20.  To remove an element from Java TreeSet object use,
21.  boolean remove(Object o) method.
22.  This method removes an element from TreeSet if it is present and returns
23. true. Otherwise remove method returns false.
24.  */
25.            
26.    boolean isRemoved = treeSet.remove(13);
27.    System.out.println("Was 13 removed from TreeSet ? " + isRemoved);
28.            
29.   System.out.println("TreeSet elements after removal : " + treeSet);
30.           
31.  
32. }
33. }

Output:

1. TreeSet before removal : [11, 12, 13]
2. Was 13 removed from TreeSet ? true
3. TreeSet elements after removal : [11, 12]

Remove all elements from Java TreeSet example:

1.Basic java example program to remove all elements from treeset.

1. package com.TreeSetExamplePrograms;
2. 
   
3. public Class TreeSetRemoveDemo{ 
5. import java.util.TreeSet;
6.  
7. public static void main(String args[]) {
8. //create TreeSet object
9.  
10. TreeSet<Integer> treeSet = new TreeSet<Integer>();
11.            
12.    //add elements to TreeSet object
13. treeSet.add(11);
14. treeSet.add(12);
15. treeSet.add(13);
16.  
17. System.out.println("TreeSet before removal : " + treeSet);
18.            
19.  treeSet.clear();
20. System.out.println("TreeSet after removal : " + treeSet);
21.            
22.  /*
23.  To check whether TreeSet contains any elements or not use
24.  boolean isEmpty() method.
25.  isEmpty() method returns true if the TreeSet does not contains any elements
26.  otherwise returns false.
27.  */
28.  
29.  System.out.println("Is TreeSet empty ? " + treeSet.isEmpty());              
30.  
31. }
32. }

Output:

1. TreeSet before removal : [11, 12, 13]
2. TreeSet after removal : []
3. Is TreeSet empty ? true